121331044421 has 2 divisors, whose sum is σ = 121331044422. Its totient is φ = 121331044420.

The previous prime is 121331044349. The next prime is 121331044427. The reversal of 121331044421 is 124440133121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117161759521 + 4169284900 = 342289^2 + 64570^2 .

It is a cyclic number.

It is not a de Polignac number, because 121331044421 - 2¹⁸ = 121330782277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121331044427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60665522210 + 60665522211.

It is an arithmetic number, because the mean of its divisors is an integer number (60665522211).

Almost surely, 2^121331044421 is an apocalyptic number.

It is an amenable number.

121331044421 is a deficient number, since it is larger than the sum of its proper divisors (1).

121331044421 is an equidigital number, since it uses as much as digits as its factorization.

121331044421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 121331044421 its reverse (124440133121), we get a palindrome (245771177542).

The spelling of 121331044421 in words is "one hundred twenty-one billion, three hundred thirty-one million, forty-four thousand, four hundred twenty-one".